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Cécile Mourer-Chauviré & Denis Geraads, the Struthionidae And

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Cécile Mourer-Chauviré & Denis Geraads, the Struthionidae And The Struthionidae and Pelagornithidae (Aves: Struthioniformes, Odontopterygiformes) from the late Pliocene of Ahl Al Oughlam, Morocco Cécile Mourer-Chauviré 1 & Denis Geraads 2 1 : UMR 5125 PEPS CNRS ; Université Lyon 1, Campus de la Doua, Bât. Géode 69622 Villeurbanne Cedex, France. E- mail: [email protected] 2 : UPR 2147, Dynamique de l’Evolution Humaine, 44 rue de l’Amiral Mouchez, 75014 Paris, France. E-mail: denis. [email protected] ABSTRACT - The Pliocene locality of Ahl al Oughlam is situated at the southeastern limit of the city of Casablanca, in Morocco, on an ancient seashore of the Atlantic Ocean. It has yielded a very rich vertebrate fauna (macro- and micromam- mals, birds, reptiles, amphibians and fishes) including both terrestrial and marine forms. On the basis of biostratigraphy, the fauna has been dated at about 2.5 Ma, which corresponds to the latest Pliocene. The avifauna is very diverse and includes birds belonging to twelve different orders. In this paper we describe only the Struthionidae and the Pelagornithidae. Ostriches are represented by a large-sized form, referred to the extinct species Struthio asiaticus Milne-Edwards, and its eggshells, of struthioid type, are comparable to those of the recent species Struthio camelus, but thicker. The Pelagornithidae, giant marine birds with bony pseudoteeth, are represented by an extinct species of the genus Pelagornis. As far as we know, this species was probably the latest representative of the order Odontopterygiformes. Keywords - Aves, Ostriches, Pseudodontorns, Pelargornis mauretanicus n. sp., Pliocene, Morocco Les Struthionidae et les Pelagornithidae (Aves, Struthioniformes et Odontopterygiformes) du Pliocène final d’Ahl al Oughlam, Maroc – Le gisement pliocène d’Ahl al Oughlam est situé à la limite sud-est de la ville de Casablanca, au Maroc, sur un ancien rivage de l’Océan Atlantique. Il a livré une très riche faune de Vertébrés (macro- et micromammifères, oiseaux, reptiles, amphibiens et poissons), appartenant surtout à des formes terrestres, mais comportant aussi des formes marines. Des arguments biostratigraphiques ont permis de dater cette faune de 2,5 Ma, ce qui correspond au Pliocène final. L’avifaune est très diversifiée et comporte des oiseaux appartenant à douze ordres différents. Dans cette étude nous décrivons seulement les Struthionidae et les Pelagornithidae. Les autruches sont représentées par une forme de grande taille, attribuée à l’espèce éteinte Struthio asiaticus Milne-Edwards, et leurs coquilles d’œufs, de type struthioïde, sont com- parables à celles de l’espèce actuelle Struthio camelus, mais sont plus épaisses. Les Pelagornithidae, oiseaux marins géants à pseudodents, sont représentés par une espèce éteinte du genre Pelagornis. Les restes trouvés à Ahl al Oughlam correspondent probablement aux derniers réprésentants connus de l’ordre des Odontopterygiformes. Mots Clés - Oiseaux, Autruches, Oiseaux à pseudodents, Pelagornis mauretanicus n. sp., Pliocène, Maroc INTRODUCTION a cliff on the shore.The fact that this site was formed along the oceanic seashore explains that both marine and terrestrial The fossiliferous locality of Ahl al Oughlam was forms were found among the birds. The mammals include discovered in 1985 by J.-P. Raynal and J.-P. Texier. It is situ- mainly terrestrial forms but the remains of a walrus and of ated at the southeast boundary of the city of Casablanca, Mo- two small cetaceans were also found. rocco, 6.5 km from the present-day Atlantic shore (Raynal et The biostratigraphical study of the mammals made al., 1990). This locality was then excavated by Denis Ger- it possible to date this locality to the Late Pliocene and to aads, within the framework of the “Programme Casablanca” attribute to it an age of about 2.5 Ma (Geraads, 1997). The of the “Institut National des Sciences de l’Archéologie et du mammals are very numerous and include more that 55 spe- Patrimoine” (INSAP), under the direction of Fatima-Zohra cies. The list of the identified taxa is given by Geraads, 1993, Sbihi-Alaoui and Jean-Paul Raynal. All the material comes 1995, 1996, 1997, 2004, 2006; Geraads et al., 1998; Geraads from a network of fissures and interconnected galleries, in a & Amani 1998; Alemseged & Geraads, 1998; Geraads & jumble of calcarenites blocks, at the foot of what was once Metz-Muller, 1999; and Eisenmann & Geraads, 2007. ORYCTOS vol. 7, 2008 169 Figure 1 - Location map of the Ahl al Oughlam locality. In addition to mammals and birds, fishes, amphib- AaO 2928; shaft of left tarsometatarsus, AaO 2216; shaft of ians, and reptiles have also been found. The amphibians and right tarsometatarsus, juv., AaO 2217; left tarsometatarsus, the reptiles other than chelonians have been studied by S. distal part, juv., AaO 2215; phalanx 1, AaO 836, and 2, AaO Bailon (2000). The material belongs to the collection of IN- 2219, of right posterior digit III; phalange 3 of posterior digit SAP, at Rabat. III, AaO 2973; phalanx 4 of posterior digit III, incomplete, Birds are very diverse and include Struthioni- AaO 877; 20 fragments of eggshells. formes, Procellariiformes, Odontopterygiformes, Pelecani- formes, Ciconiiformes, Anseriformes, Galliformes, Grui- Dimensions formes, Charadriiformes, Columbiformes, Psittaciformes, The material is very fragmentary and it is not al- Strigiformes, and Passeriformes. The present study concerns ways possible to take the standard measurements such as only the Struthionidae and Pelagornithidae. The anatomical width and depth of the proximal and distal parts, but when terminology generally follows Baumel & Witmer (1993), taking partial measurements and comparing them with the and Howard (1929) when necessary. The following museum same measurements taken on recent Struthio camelus, it is acronyms are used: BMNH, The Natural History Museum, found that they are on average 20 % larger than on a large London (formerly, British Museum (Natural History)); male individual (fig. 2). MNHN, Muséum National d’Histoire Naturelle, Paris; UCB, The measurements which could be taken are as fol- Université Claude Bernard, Lyon; USNM, collections of the lows (in mm): former United States National Museum, now in the National Proximal femur (AaO 873): maximum proximal Museum of Natural History, Washington, D.C. width: 134; minimum depth of collum femoris: 51 ; depth of caput femoris: 57.5. SYSTEMATIC PALEONTOLOGY Proximal tarsometatarsus (AaO 2928): proximal width: estimate superior to 92; width of the shaft at the level Order STRUTHIONIFORMES (Latham, 1790) of the distal end of the tuberosities for M. tibialis cranialis: Family STRUTHIONIDAE Vigors, 1825 ca. 47; depth of the shaft at the same level: ca. 51. Genus STRUTHIO Linnaeus, 1758 Distal tarsometatarsi AaO 2218 and AaO 2860: width of the shaft 10 cm proximad to the distal foramen 39.2; Struthio asiaticus Milne-Edwards, 1871 depth of the shaft at the same level: 27.8; AaO 2218: distal fig. 2-3 width at the level of the distal foramen: 64.0. The measurements of the phalanges are given in Material table 1. Dorsal vertebra and fragment of dorsal vertebra, AaO 835, 1444; 3 fragments of pelvis, AaO 703, 874, 875; Description fragment of rib, AaO 876; several pieces of a left femur, AaO Very numerous fossil forms of ostriches have been 873; left femur, distal part, AaO 700; shaft of left femur, juv., described from the Late Miocene, the Pliocene, and the AaO 3468; right femur, distal part, AaO 701; fragment of Pleistocene of Eurasia, both on osteological and eggshell right femur, distal part, AaO 702; left tibiotarsus, distal part, remains. According to Kurochkin & Lungu (1970), and AaO 1443; left tibiotarsus, distal part, juv., AaO 2214; right Mikhailov (1992), all the European and Asiatic Pliocene tarsometatarsus, distal part, and left tarsometatarsus, distal forms, described from osteological remains, are very similar part, from the same individual, trochleae not preserved, AaO and have been synonymized with the species Struthio asi- 2860, 2218; left tarsometatarsus, proximal part, incomplete, aticus Milne-Edwards, described from the Pliocene of the ORYCTOS vol. 7, 2008 170 Figure 2 - Struthio asiaticus, Ahl al Oughlam. a-b: left femur, proximal part, AaO 873; a) caudal view, b) cranial view. Same scale for a and b. c-d: phalanx 1 of right poste- rior digit III, distal part, AaO 836; c) dorsal view, b) plantar view. e-f: phalanx 2 of right posteri- or digit III, AaO 2219; e) dor- sal view, f) plantar view. Same scale for c, d, e, and f. Siwaliks (Milne-Edwards, 1867-71). However, according to All the species described from osteological remains Mikhailov (1992: p. 370) “the eggshell remains… are dis- from the Late Miocene, the Pliocene, and the Early Pleis- tinct and the features of each “eggshell morphotype species” tocene of Europe and Asia, with the exception of S. orlovi, evolved independently from the Miocene to the Pleistocene”. from the Late Miocene of Moldavia (Kurochkin & Lungu, The “eggshell species” need to have their own names, at 1970), are massive, heavy ostriches, characterized by dimen- least parataxonomic ones. For that reason the eggshells are sions and robustness larger than those of the recent ostrich, S. referred to three different species: S. asiaticus, which has camelus. This also applies to the ostriches which have been struthioid type eggshells, S. chersonensis, which has mixed described after the publication of Kurochkin and Lungu’s aepyornithoid-struthioid type eggshells, and S. transcauca- (1970) work, for example S. dmanisensis, from the Early sicus, which has aepyornithoid type eggshells (Mikhailov, Pleistocene of Georgia (Burchak-Abramovich & Vekua, 1988, 1992). 1990). Although S. asiaticus is not taller than the recent os- ORYCTOS vol. 7, 2008 171 Figure 3 - Struthio asiaticus, Ahl al Oughlam. Scanning electron microscope pictures of eggshell fragments showing the complexes of pore openings: a-b: eggshell n° 7; c: eggshell n° 8; d-f: eggshell n° 20. For the eggshell fragment n° 20, the pore openings are particularly visible because of deposits of Mn salts inside them. (Scale bars = 0.1 mm) trich, it is also a massive form, as shown by the proportions of the phalanx 1 of posterior digit III (table 2).
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